mono to stereo

i've got a video with mono sound and i want to duplicate that mono channel so that the audio is stereo. i know that you can do this with getchannel() and audiodub(), but is there a simpler method? (in case u were wondering, i need stereo for compatibility with other clips)

GetChannel(1,1) or MonoToStereo(last,last)

k thx, it worked. i thought that getchannel() didn't put the audio back into the video, so i thought that audiodub was needed too